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NOV- 13, 1962
J. c. WHITE
3,063,405
PNEUMATIC SIGNALING DEVICE
Filed June 15, 1960
JAMES C. WHITE
îmä
3,063,405
te
Patented Nov. 13, 1962
1
2
a source 64 to the pipe 5S, and, alternatively, vents
such air from pipe 58 by way of a pipe 66 leading to at
biosphere. Valve 62 includes a hollow valve body 68
enclosing a chamber 70 containing an axially slidable
valve plunger rod 72. At four points along the wall
of the hollow chamber 70 are provided bridges 74, 76,
78 and 80. Each of these bridges supports an O-ring
82 slidably engaging and embracing the surface of rod
3,063,405
James C. White, Hammondsport, N.Y., assignor to In
PNEUMATIC SIGNALING DEVICE
gersoll-Rand Company, New York, N.Y., a corpora
tion of New Jersey
Filed June 15, 1960, Ser. No. 36,386
5 Claims. (Cl. 116-65)
This .invention relates to signaling devices and more
v 72. O-rings 82 at ybridges 74 and 80 act as common
particularly to a device for signaling conditions of danger. 10 sealing members around the rod 72 to prevent leakage
In the operation of machinery many dangerous con
into the ends of the hollow chamber 70. At a point
ditions may occur that are not readily apparent to the
intermediate its length, rod 72 is provided with a necked
attendant operating the machinery. For example, these
down portion 84 forming shoulders 86 and 88 ’adapted
dangerous conditions may include excessive rotative
to slide past the O-rings 82 at the -bridges 76 and 78,
speed, high voltages, lack of lubricating pressure, high 15 respectively, to permit the passage of air lfrom pipe 64
cooling -water temperature. Normally, when a danger
to pipe 58 or exhaust air from pipe 58 to pipe 66. The
ous condition occurs, the attendant’s attention should be
axial movement of rod 72 is accomplished and controlled
quickly directed to the condition, by visual, aural or some
by the condition of danger which is to be indiacted on
other alarm, in order for him to take action to relieve
panel 10.
the dangerous condition.
20
In this instance, the valve rod 72 is controlled by the
It is an object of this invention to provide a signal
temperature of cooling water, as indicated at 90, Within
ing device which is easily mounted on a panel connected
an engine water jacket having a -wal1 92. Accordingly,
to the apparatus whose condition is to be indicated, pro
valve 62 is threaded into wall 92 at 94 and carries heat
v_ides an easily observable signal, is reliable in its op
expansible element 96 submerged in the jacket water
eration, is inexpensive, and has other advantages which 25 90. The' heat-expansible element 96 expands when the
will be pointed out hereinafter or are obvious.
temperature of the water 90 rises and pushes the valve
The sole FIGURE in the drawing is a longitudinal
rod 72 upwardly to shut oíf the supply of air pressure
section of a preferred embodiment of the device particu
from pipe 64 to pipe 58 by closing communication at
larly adapted for use in indicating high water tempera
O-ring 82 mounted on bridge 76 and, simultaneously
tures in a cooling system.
The signaling device of this invention is sho-wn in the
drawing as being mounted on a panel 10. The signal to
the operator is conveyed by a signal member 12 which
slides up and down before an aperture 16 in the panel
10.
30 vents the a-ir pressure in pipe 58 past the shoulder 88 to
exhaust pipe 66. When the air pressure in the pipe 58
is vented, the latch 40 is released Ífrom plunger 28, per
mitting spring 36 to press plunger 28 downwardly to
the position shown in the drawing, to also drop the sig
The aperture 16 contains a hollow casing 14 ex 35 nal member 12 to its lower position.
The heat-ex
pansible element 96 may, »for example, be the type of
heat-expansible bellows which is found in the conven
of the casing 14. On casing 14 is also mounted a bezel
tional automobile radiator thermostat for controlling the
20 »for supporting a window 2,2 over the aperture 16. The
flow of coolant through the radiator system.
signal member 12 carries suitable indicia which is visible 40
In its lower position, the surface on the signal member
to the attendant through the window 22 to indicate its
12 visible from the opposite side of panel 10 through
tending through the aperture 16 and being secured thereto
by a ring 18 surrounding the forward projecting portion
alternate up or down positions.
The signal member 12 is adapted to move up and
down in a groove 24 in a body 26 mounted on the panel
10. A cylindrical plunger or piston 28 is. slidably
mounted in a cylindrical bore 30 in the body 26.
Plunger 28 extends slightly from bore 30, and is attached
to an inwardly turned ñange 32 of the signal member
12. A bracket 34 extends upwardly from body 26 and
forms an abutment for a biasing coil spring 36 which
presses down against plunger 28 and seats in a bore 38
in the top of the plunger 28.
Plunger 28 is held in its uppermost position by a latch
40 which has a rod-like end 42 extending through co1'
responding small bore 44 in body 26 transverse to the
axis of plunger 28. Latch 40 has a head portion 46 fit
ting closely in a large bore 48 which is coaxial with bore
44. An intermediate bore 50 is located in the body 26
between the large and small bores 48 and 44 and con
tains a coil spring 52 pressing against head 46 to bias
latch 40 in a direction away from plunger 2S. In its
window 22 is suitably colored red or inscribed to indica-te
45
to the attendant the dangerous high temperature of the
jacket water 90. Presumably, the attendant will Jtake
action accordingly.
Means is provided by which the attendant may restore
signal member 12 to its upper position indicating safe
operating conditions. However, plunger 28 will not be
able to remain in its upper position for such indication
50 until valve 62 is in its former position to supply air pres
sure to force the latch 40 to its plunger engaging position.
It will also be observed that failure of air supply at pipe
55
60
64 will also be indicated as a dangerous condition by
this device.
Means is provided to restore plunger 28 to its upper
position wherein it is latched by the latch 40. This means
includes a manually controlled pneumatic means 98 for
momentarily supplying air pressure from the pipe 64 to
the lower end 29 ofthe plunger 28 in the bore 30.
For this purpose, the body 26 is provided with a pas
sage 100 communicating between the bottom of the bore
30 and a pipe 102 which is threaded into the body 26.
The plunger 28 is sealed within bore 30 by a piston ring
plunger 28 to receive the rod-like end 42 of latch 40.
103. Manually controlled means 98 consists primarily
The latch 40 is placed into engagement with plunger 28 65 of a valve body 104 containing a bore 110 holding an '
by air pressure applied to the outer face 47 of head 46.
axially slidable plunger rod 106. A pipe 108, branching
A head cover 56 is secured on body portion 26 to en
from pipe 64, is connected to the valve body 104 to admit
close the end of cylindrical bore 48. Air pressure is
air into the bore 110 of valve body 104. Rod 106 is pro
supplied to the outer face 47 of the latch head 46 through
vided with a necked down portion 112 forming shoulders
uppermost position, plunger 28 is engaged and locked
in position by latch 40, a groove 54 being provided on
a pipe 5S threaded into an aperture 60 in head cover 56.
114 and 116 on valve rod 106 which slide in O-rings 118
A valve 62 controls the supply of compressed air from
and 120, supported on spaced bridges 122 and 124 of
3,063,405
»
3
operative, in response to the occurrence of a danger con
the walls of the bore 110. The O-rings 118 and 120
straddle the inlet 126 of the pipe 102 connected to the
valve body 104. Rod 106 projects from the front end
of the valve-body 10d»4 and has a head 127 by whichV the
operator is able to move valve rod 106 axially. When
he pushes rod 106 in, a-ir from pipe 108 is admitted past
dition which is to be indicated by the signaling device,
to close oñ pneumatic pressure to said pneumatic means
wherein said latch is biased to its second position to re
lease the signal member and allow it to move to its
danger indicating condition; pneumatic reset means oper
ative, when supplied with pneumatic pressure, to return
said signal member to its safety indicating position; and
manually controlled means operative, in response to be
shoulder 114 to aperture 126 and thence to pipe 102 to
actuate plunger 28. Pulling rod 106 to the left vents
air from pipe 102, past shoulder 116 and out of an
exhaust port 128 to atmosphere.
The ends of valve rod 106 are sealed in the bore 110
by suitable O-rings 130 to prevent leakage at its ends.
Any leakage past the ends of the valve rod 106 is able to
escape to atmosphere through vents, 132 and 134, at
opposite ends of bore 110, so that no pressure can ac
ing actuated by an operator, to momentarily supply pneu
matic pressure to said pneumatic reset means for causing
said reset means to return said signal member to its
safety indicating position.
2. The signaling device of claim 1 wherein: said sig
15 nal member includes a piston slidably mounted in a ñrst
cumulate to unbalance rod 106. Similarly vents 136 and
13S are provided in valve 62.
The operation of the device is obvious from the above
description of the various elements of the invention and
their functions. It is to be noted that signal member 12 20
bore in said body and being spring biased inwardly to
ward the bottom of the first bore; and said latch is a
second piston slidably mounted in a second bore located
in said body to extend transverse to the iirst bore and be
ing spring biased outwardly in said second bore, said sec
ond piston having an element arranged to extend through
is normally in its upward position at which suitable
the bottom of said second bore and, when said second
indicia on the face of member 12 is observable through
piston is moved inwardly toward the bottom of said sec
the window 22 to indicate normal or safe operation of
ond bore, to engage and latch said ñrst piston in a posi
the device being attended. In this position, latch 40
tion spaced outwardly from the bottom of said first bore.
holds plunger 28 until an abnormal condition exists, in 25
3. The signaling device of claim 2 including: means
this case either overheating of water indicated at 90, or
for admitting pneumatic pressure to the bottom of said
failure of air pressure in the air supply 64, whereupon
first bore to force said first piston outwardly in said bore;
latch 40 is released by the valve 62 closing olf air pres
and means to apply pneumatic pressure to the outer end
sure to the pipe 58, the supply of which is cut olf at
of said second piston to force it inwardly into said second
shoulder 86, and exhausting residual air from pipe 58 to 30 bore.
pipe 66, past shoulder 88 of valve rod 72.
4. The signaling device of claim 3 including: a signal
Upon return to normal conditions of air pressure or
indicating window mounted on said body; and said sig
water jacket temperature, the depression of the button
nal member includes a surface carrying indicia which
127 on the valve 98 supplies a-ir under pressure through
is visible through the Window to alternately indicate
35
pipe 108, past the shoulder 114 of valve rod 106 and
the danger and safety positions of said signal member.
through the pipe 102, to force the plunger 28 upward to
5. A pneumatically operated signaling device compris
again bring the annular groove 54 into registry with latch
ing: a body; a signal member mounted on said body for
40. If rod 72 has resumed its normal position, air pres
movement between alternate positions and operative to
sure is admitted past the shoulder 86 and into pipe 58
alternately indicate safety and danger conditions in its
to depress latch 40 into the plunger groove 54 to latch 40 alternate positions; a latch movably mounted in said body
the plunger 28 in its raised position. In its raised posi
for movement between a first position, wherein it latches
tion, the signal member 12 has its lower surface exposed
said signal member in its safety indicating position, and
at the window casing 14 and will indicate a normal and
a second position, wherein said signal member is un
safe condition.
latched; a ñrst pneumatic means operative, when supplied
Thus, by the above construction are accomplished,
with pneumatic pressure, to force said latch to its first
among others, the objects hereinbefore referred to.
position; means normally biasing said latch to its sec
I claim:
ond position and operative, when pneumatic pressure is
l. A pneumatically operated signaling device com
closed off to said first pneumatic means, to move said
prising: a body; a signal member mounted on said body 50 latch to its second position to release the signal member;
for movement between alternate positions and operative
means normally biasing said signal member to its danger
to alternately indicate safety and danger conditions in its
indicating position and operative to move said signal
alternating positions; means normally biasing said signal
memebr to its danger indicating position when said mem
member to its danger indicating position; a latch movably
ber is unlatched; and pneumatic reset means operative,
mounted in said body for movement between a first posi
lwhen supplied with pneumatic pressure, to return said sig
tion, wherein it latches said signal member in its safety
nal member toits safety indicating position.
indicating position, and a second position, wherein said
signal member is unlatched; means normally biasing said
References Cited in the file of this patent
latch to its second` position; a iirst pneumatic means oper
UNITED STATES PATENTS
ative, when supplied with pneumatic pressure, to force 60
Cook ______________ __ Aug. 5, 1952
said latch to its first position; means for normally sup
2,605,736
Smith ______________ __ Oct. 18, 1960
2,956,537
plying pneumatic pressure to said pneumatic means and
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